<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<title>Main top page</title>
<head>
	<script type="text/javascript" >
	
	function toggle1() {
		if(document.getElementById("button1").value == "Click Me !")
			document.getElementById("button1").value = "I'm clicked";
		else
			document.getElementById("button1").value = "Click Me !";
		//document.getElementById("button2").disabled = false;		
	}
	
	function toggle2() {
		//document.getElementById("button1").disabled = false;
		document.getElementById("button2").disabled = true;		
	}
	
	</script>
</head>

<body>                            
	<input id="button1" style="display:block" class="btn" type="button" 
        name="firstButton" onclick="toggle1();" value="Click Me !" /> 
	<input id="button2" style="display:block" class="btn" type="button" 
        name="secondButton" onclick="toggle2();" value="Click Me Too!" /> 		
        <iframe id="frame0" src="./page0-0.html"/>
</body>

</html>
